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With his piercing blue eyes and sexy smile, "The Hangover Part II" star Bradley Cooper is rapidly becoming one of Hollywood's most sought after leading men.

However, the actor, who recently starred alongside veteran screen staple Robert De Niro in the sci-fi thriller "Limitless," says no matter how successful his career becomes, talking about his "private life" will always be off limits.

"I'll never do it, no matter what's written about me," Bradley told GQ Australia in an interview for their June/July issue. "Some things you just have to keep to yourself. I'll talk about my personal past, family and other stuff but when you bring in other people, I feel there's no reason for it."

While he may not discuss his love life, Bradley was happy to discuss his experience on his last film – and working with Robert, which, he told the mag, "way surpassed anything I could imagine."

"In no scenario did I envision [Robert] becoming a really great friend of mine. I thought at best we'd have a good experience, but I really care for him," he told the mag. "He's a friend of mine. I would be there for him if he needed me and he's been wonderful. I just love him. He's the greatest."

Bradley, 36, also got his first taste of producing with "Limitless."

"If I could produce every movie I'm involved in, I would," he said. "I love every aspect of it."